<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>file is blob</title>
  </head>

  <body>
    <input type="file" id="input" />

    <script src="../../dist/ut2.js"></script>
    <script>
      const oInput = document.querySelector('#input');
      oInput.addEventListener('change', (e) => {
        const file = e.target.files[0];
        console.log(Object.prototype.toString.call(file));
        console.log(ut2.isBlob(file));
      });
    </script>
  </body>
</html>
